Re: Fag packet calculation time...
"Assume by 2040 that an electric car can do 300miles per charge.
Fine, now work out how much energy that represents, multiply it by 25million, and you'll find that you need a large increase in grid supply."
That does not make any senses there is no calculation that can multiply 25 million by x to show the increase in grid supply needed based upon range for a full charge.
How often it is charged an dby how much could start providing figures. If your assumption is a full charge by 25million at the same time then that is why the calculation is completely wrong - see post regarding mileage per year.